The Basics of Search. Returning search results is no easy feat, and involves complex, near-instantaneous algorithmic calculations. A search for something as simple as “cat” could yield over 55 million results.

Questions and answers about artificial intelligence (AI), and how it's used in Microsoft products such as Microsoft Copilot.

Learn how to receive a refund or exchange for items purchased from Microsoft.

Find out how to submit a request for a refund for a purchase of digital Xbox content.

我的产品密钥不起作用. 如果 Office 产品密钥不起作用，或已停止工作，应与卖家联系，申请退款。 如果产品密钥是独立于软件购买的，则很可能是被盗的产品密钥，或者是以欺骗方式获得随后阻止使用的产品密钥。

The new Office Theme is on its way and will soon be available to all Office users. This new look specifies an updated standard color palette and type font that are applied throughout Microsoft Office.

Set up the Microsoft Authenticator app from the Security info page. Depending on your organization’s settings, you might be able to use an authentication app as one of your security info methods.

Découvrez comment résoudre les problèmes liés aux mises à jour de Windows. Trouvez des réponses aux questions et problèmes courants lors de l’installation Windows mises à jour.

Some extensions change browser settings like your default search engine, new tab page, and other types of site data. To prevent extensions from changing the preferences you set up when you installed Microsoft Edge , the browser automatically turns off extensions that might change your preferred settings.. You can change settings for your extensions at any time.

To get someone's attention in a channel conversation or a chat, @mention them. Just type @ before their name and then select them from the menu that appears.